Affordability and Borrowing Terms

Affordability jargon matters because a mortgage decision is not built on one number.

Lenders look at the size of the deposit, the amount you want to borrow, your income, your regular outgoings and how resilient the budget still looks once the mortgage payment is added.

Use the terms below when you want to read an affordability result more clearly and understand why a lender’s figure can move.

Deposit

The deposit is the cash you put towards the purchase price yourself.

For many buyers, the deposit is the first affordability hurdle. Most mortgages ask for at least 5% to 10% of the property price, and a bigger deposit usually means borrowing less and reaching lower loan-to-value bands.

Loan-to-Value (LTV)

Loan-to-value compares the mortgage amount with the value of the property.

If you buy for £250,000 and borrow £225,000, the mortgage is 90% LTV. A lower LTV usually means lower risk for the lender, which is why pricing and product choice often improve as the deposit increases.

Low-Deposit Mortgage

A low-deposit mortgage usually means a deal where the buyer is putting down a relatively small deposit, often around 5%.

These products can help buyers move sooner, but they usually leave less room if the valuation comes in lower than expected or if the lender’s pricing changes by LTV band.

Loan-to-Income Ratio

Loan-to-income is the borrowing amount compared with annual income. It is also sometimes described as an income multiple.

Many lenders cap maximum borrowing at around 4.5 times annual income, but many borrowers are offered less after the lender reviews the wider case. That is why an affordability estimate is only a starting point, not a promise of the final offer.

Affordability Assessment

The affordability assessment is the wider check a lender carries out before deciding what monthly payment looks manageable.

This is where the lender moves beyond a simple income multiple and starts looking at the rest of the budget, including income, regular spending, existing credit commitments and how secure the overall case looks.

Outgoings

Outgoings are the regular costs already leaving your budget before the mortgage payment is added.

They can include loans, credit cards, childcare, maintenance payments, transport, utilities and any other fixed commitments. Two applicants with the same salary can therefore receive very different mortgage offers once outgoings are taken into account.

Credit Commitments

Credit commitments are the debts and finance agreements the lender has to factor into the affordability check.

That can include personal loans, car finance, credit cards and other borrowing already linked to the applicant. Even where the income is strong, existing commitments can reduce the room left for a new mortgage payment.

Credit Check

Lenders usually look at the applicant’s credit record as part of the mortgage decision.

The credit file is not the whole affordability assessment, but it still matters because missed payments, defaults or other problems can change the products available or reduce what a lender is willing to offer.

If you want to apply these terms to a real case, use the Affordability Planner and the First-Time Buyer Guide.